I think if the MTA sends a 5xx rejection code due to message size ASSP 
will proxy that to the sender instead of 220 OK, thus no backscatter. 
Mailbox full is a very common reason for backscatter spam though becase 
most MTA's can't determine during the SMTP session if the mailbox will 
be full (not properly configured probably) so they just accept it and 
send NDR's later. But ASSP can't do anything about that


On 9/29/2009 9:31 PM, Scott Haneda wrote:
> How does rejection of oversized messages work in this case? Wouldn't
> the primary MTA reject back to ASSP, (backscatter)?
>
> It's like greylisting, while I can do this on my MTA, if I do, it will
> break when any proxy sits in front of ASSP.
>
> How does one define MTA specific features that can cause rejections
> and not have rejection message issues? Perhaps I am misunderstanding
> the mail flow.
>    


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